I follow the simple instructions at http://en.support.wordpress.com/videos/youtube/ but YouTube video embedding never works (just the URL shows up).
I copy the link location from the address bar and paste it on a line by itself. I even tried the shortcode procedure but it makes no difference.
Here's what the text (on a line by itself) looks like:
After publishing this line shows instead of the embedded video.
Can anybody explain how to make this work?